You must give credit to the sources that you use for your assignment. This includes websites, books, articles, interviews, etc.
Many different citation styles exist, so check with your professor to see what their preferred style is.
On this page we point you to resources on the style that is most commonly used in this subject.
The best way to avoid plagiarism, is to cite your sources.
Plagiarism is:
"• representing another's work in whole or in part as one's own in an exam or paper,
• knowingly including a false statement or reference as if it were true, or
• submission by the student of the work prepared for a different course without the express consent of the instructor."
--- King's Academic Calendar (p. 64)
Put simply, plagiarism is literary or intellectual theft. As defined at The King's University:
Source: Avoiding Plagiarism.” Office of the Dean of Students. University of Alberta